Fuel economizer



FIG. 1 is a top plan view of a fuel economizer showing my new design;

FIG. 2 is a front elevational view thereof, the back side being a mirror image thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a fuel economizer, as shown and described. 